rajeev krishnan senior consultant microsoft...
TRANSCRIPT
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Rajeev KrishnanSenior ConsultantMicrosoft Corporation
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Scope
Voice with Office Communications Server
Enterprise Voice PlanningDeployment Scenarios
Sizing and Topology considerations
Call Routing and Management
Interoperability with existing telephony infrastructure
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Out of Scope
Integrations that don’t involve Voice
Client-based plug-insPBX-based controls hosted inside Communicator
Features, Experience, Capability vary widely
Remote Call ControlOffice Communicator controls a PBX station set
Consider a third party Gateway instead of an upgrade: Corebridge, Genesys, Estos
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Agenda
Prerequisites
Enterprise Voice Elements
Deployment Scenarios
Recommendations & Next steps
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Your current state?
No voice with Office Communications Server…yetHow do I get started with a pilot?
Validate the technology & business case
Pilot completed and successfulHow do I move the pilot to production?
Breadth - more & different users & cases
Initial deployment completed and successfulHow do I grow production to scale?
Business critical, multi-site communications
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Prerequisites to deployment
Windows Server 2003 Domain functional levelAD used to store global settings & groups
Single-forest & multiple-forest environments
Exchange Server 2007 with Service Pack 1Unified Messaging, Missed Call Notification, Auto Attendant, Outlook Voice Access
Assess your IP Network for real-time trafficBandwidth
Latency & other network affects
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Your IP Network
BandwidthProvision for streams of 45Kbps audio, 300Kbps video
Modeling calling patterns: Intra/inter-office, external
Other network affectsReduce delay: < 150ms E2E delay considered excellent (G.114)
Some jitter (< 30ms) & loss (< 10%) can be handled
Prioritizing Media with DiffServAudio: Expedited Forwarding; Video: Assured Forwarding
Centralized policy enforcement for Vista PCs
Controlling UsageManage the size of conferences, allowed media
Set port range for media, per session BW limits, video quality
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Telecom Regulations
TRAIRegulations prohibit direct interconnect of telephony network with IP
Government now allows use of single IP-PBX that can be logically partitioned
TRAI has recommended additional relaxations of these regulations
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Your (future) Voice Network
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Enterprise Voice Elements
Mediation Server: Intermediate signaling and call flow
Manage innovative elements of the SIP transaction: Inside, TLS/SRTP – Outside, TCP/RTP
Transcode media flows from G.711 to RTAudio and SIREN
Act as an ICE Client for PSTN-originated calls
Provide quality metrics back to monitoring server
Upstream telephony elementsSIP/PSTN Gateway
IP-PBX
SIP Trunking Service
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UC Open Interoperability Program (UCOIP)
Qualification program for telephony infrastructure –SIP/PSTN Gateways, IP-PBXs & SIP Trunking ServiceGoal for seamless interoperability with Office Communications Server and Exchange ServerEnsure Customers have positive experiences withSetup, Support, and Use of qualified devicesAllows for scalable qualification of vendors
http://technet.microsoft.com/UCOIP
SIP/PSTN Gateways IP-PBXs SIP Trunking Service
Aculab, Audiocodes, Cisco, Dialogic, Ferrari, NEC, NET, Nortel, Nuera, Quintum, Tango Networks, Vegastream
InnovaphoneMitelNortelSeltatel
InterouteGlobal CrossingSprint
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Tested IP-PBXs
PBX vendors qualify their latest versions
Customers want support for existing versions
Where possible, Microsoft may test IP-PBXsTo date: Cisco Unified Communications Manager
Listed with qualified infrastructure on UCOIP
OCS 2007 OCS 2007 R2
CUCM 4.X 4.2(3)_SR3a 4.2(3)_SR3a4.2(3)_SR4b
CUCM 5.X 5.1(1b) 5.1(1b)5.1(3e)
CUCM 6.x 6.1(1b) 6.1(1b)6.1(3a)
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Voice deployment continuum
Voice Capabilities with an existing IP-PBXLong-term interoperability for all end-users
Combined experience of Communicator & PBX Phone
Mixed environment with PBXSome users will be on the PBX, others will move
Mix expected to change over time
Office Communications Server for VoiceEnable a temporary transition state
Prepare for your PBX-less future
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Deployment Scenarios
Overlay PBX: Shared Dial PlanDual Forking: PBX rings to phone & Communicator
Multiple Dial Plans: multiple numbers per user
Networked PBX: Split dial planMediation Server located behind the PBX
Connect using SIP/PSTN Gateway or Direct SIP
Direct to PSTN: Owned dial planCalls are sent/received directly with PSTN
SIP Trunking from carrier or circuits to Gateway
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Deployment Scenarios
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Overlay PBX Dual Forking
Calls from PSTN & PBX phones are forked by IP-PBX to Office Communications Server
Any calls made by Office Communicator are also forked to IP-PBX
Provides a blended, single number experience for end-users
Each infrastructure elementimplements equivalent dial plan
PBX upgrade required for Direct SIP plus Dual Forking qualification
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Overlay PBXMultiple Dial plans
Each user has two numbers – one for Office Communicator & one for PBX
No forking. Users configure personal call forwarding between systems
Configure with SIP/PSTN Gateway or Direct SIP to IP-PBX
If using Gateway, trunk expense rises as size of deployment grows
Fundamentally a transition over time, assume PBX phone goes away
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Deployment Scenarios
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Networked PBXUsing a SIP/PSTN Gateway
Users are moved off the PBX
Calls delivered from PSTN to PBXand routed to SIP/PSTN Gateway
Wide availability of Gateways for geography & circuit configurations
Dialing behavior preserved for calls between all users
Fast & inexpensive to deploy forpilot & smaller production
Double-trunking through the PBX increases cost with scale
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Networked PBXDirect SIP
Users are moved off the PBX
Calls delivered from PSTN to IP-PBX
Mediation Server connects directly to SIP interface on supported IP-PBX
But still a server to server trunk – not client to client due to lack of ICE negotiation, security, etc.
May require additional software, licenses or upgrades to the IP-PBX
As production deployments grow, Direct SIP has OA&M advantages
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Deployment Scenarios
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Direct to PSTNIP-IP Gateways
Mediation Server sits behind same SIP/PSTN Gateway used by IP-PBX
Supported configuration as long as the Gateway is qualified with OCS
Gateway routes based on DID or trunk group, may require configuration on the carrier
Some Gateways support doing an AD Query for routing determination
Increased flexibility and negligible impact to trunking costs when moving users from PBX
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Direct to PSTNUsing a SIP/PSTN Gateway
Separate PSTN interconnect infrastructure from PBX
Number routing change or new numbers provisioned by Carrier
Requires zero PBX changes, eventually move trunks from PBX to SIP/PSTN Gateway
Internal calls between user groups routed through PSTN
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Direct to PSTNSIP Trunking
Connecting Mediation Server to SIP Trunking Service
No on-premise third party products (SBCs, etc.) required
Uses nailed up VPN to Service Provider for security
Brings telephony trunking into datacenter consolidation strategy
Still early days…not all carriers signed on to support modern (SIP Connect 1.1) standards
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More Options
All of these can be deployed in a mixed fashion
Scenarios can change as deployment matures
Trunking both to IP-PBX and PSTN clouds
Use Gateways for Pilot, Direct SIP to HQ IP-PBX, keep some users on PBX but move others
Pilot Deploy Scale
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User populations to consider
Mobile & RemoteGreat pilot users to validate capability
Discontinuous number range
Headquarters / Single SiteExpect a mix of Communicator & PBX for coverage of all enterprise telephony features
Most IW users can use Enterprise Voice exclusively
Branch OfficeGateways for Least Cost Routing & Local number termination
WAN Survivability via Cell Phone & Internet
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Deployment factors to consider
Deployment Goal
With Existing IP-PBX
Mixedenvironment
OCS for Voice
Company Size
250
1000
5000
10,000
50,000
Current Stage
No VoiceDeployed
Pilot Successful
Initial Deployment Successful
User Population
Mobile & Remote
Employee
HeadquartersSingle Site
Branch Office
Deployment Scenario
Overlay PBX
Networked PBX
Direct to PSTN
Interop
SIP/PSTN Gateway
IP-PBX
SIP TrunkingService
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RecommendationsNo OCS Voice yet – heading to pilot
Start thinking about scaleArchitecture: HA, DR, Security, Management
Validation & Testing of headsets, devices, etc.
Build a solid infrastructure foundationAddress any outstanding issues with these elements
Anything with AD, DNS or Certificates will surface
Telephony integration for rapid successGateways maximize flexibility
SIP Trunking maximizes environmental simplicity
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Recommendations Successful Pilot , heading to production
Scale thinking pays off – now take the next stepLook at traffic flows on LAN/WAN
Managing usage as appropriate
Costs of Least Cost Routing vs. PSTN / Carrier
Respect the UsersDeploy Monitoring
End-user training resources
Telephony integration for scaleIP-PBXs: Direct SIP behind or alongside
TDM PBXs: Direct to carrier
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Moving to OCS Voice"I'm done with my PBX!"
Deploy a gateway to the PSTN or SIP Trunking
Give everyone OCS Voice
Remove desk phones for those who don't need them - give others the choice
Users on PBX can do personal call forwarding from Desk phone to OCS phone
Turn off the PBX
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What's next?
Move your pilot forward to production
Know that upgrading your IP-PBX is not the first step on the road to Unified Communications
Experience the end-user capability anywhere! FREE Hosted Trial at https://r2.uctrial.com
Check out the administration experience!FREE OCS VMs at http://microsoft.com/VHD
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Voice Resources
Programs & StandardsUnified Communications Open Interoperability Program
Microsoft Office Protocol Documentation
White PapersIntegrating Telephony with Office Communications Server 2007 and 2007 R2
Microsoft Quality of Experience
DocumentationVoIP Architecture
Configuring Voice Quality of Service
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www.microsoft.com/teched
Sessions On-Demand & Community
http://microsoft.com/technet
Resources for IT Professionals
http://microsoft.com/msdn
Resources for Developers
www.microsoft.com/learningMicrosoft Certification and Training Resources
www.microsoft.com/learning
Microsoft Certification & Training Resources
Resources
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